PLATS.NET is a system developed by the Maryland State Archives, the Administrative Office of the Courts and Maryland Circuit Court Clerks to preserve and make accessible all plats filed with the Land Office and the Circuit Courts of Maryland. The site includes land survey, subdivision, and condominium plats from 1658 to 2023.

Among this collection of material related to land records are Provincial Court Land Records that include land records from the 1700s.

The David Rumsey Map Collection is an extensive online global map collection. There are over 420 Maryland maps included.

This site focuses principally on mapping of early patents and land grants in central Maryland, and also provides additional Maryland genealogy research aids, including search aids for Baltimore City and Baltimore County records.

Information on Maryland land records, tax records, maps, and other geography-based sources for Maryland.

When researching a known address, start your land title research here.

Medusa is the Maryland Historical Trust's online database of architectural and archaeological sites and standing structures and includes an online mapping component.

Maryland's Environmental Resources and Land Information Network (MERLIN) allows users to research and produce a custom map of any location in Maryland, including their choice of base maps and data layers.

Digitized Land Office patents from 1637-1975.

Maryland State Archives card index to certificates of survey and land patents.

This video tutorial by the Maryland State Archives shows how to search for older land records through MDLANDREC.

The New Early Settlers of Maryland is a database of settlers named in Maryland land patent volumes and a land warrant volume from 1633-1685.

Index to Land Office warrants from 1636-1842.

A collection of links to historic maps of Baltimore and surrounding counties.